Given z=x^2+y^2
And also z=y
Given z=x^2+y^2
I have the following information for region R.
R = (x,y) such that x^2 +(y-1/2)^2 < or = 1/4
why R = ( r,theta) such that 0< or = r < or = sin theta ? I don't understand how r = sin theta. Could you please explain to me? Thank you very much.